The sound quality is good.

Quality of sound is fine, we dont experience any static or poor quality sound (we do have DSL filters - you may need these

Poor sound quality; I have difficulty understanding it.

The tiny speaker in my cell phone has much better sound quality, leading me to think that this phone is an obsolete design.

I tend to prefer using a land-line at home because the audio quality is usually better

Quality of sound is fine, we dont experience any static or poor quality sound (we do have DSL filters - you may need these

But otherwise are good quality.